Arnold, CA Radon Mitigation and Testing

Q: What is the average radon level in Arnold, CA?

Based on 3 user-submitted tests, the average radon level is 5.70 pCi/L.

Q: What EPA Radon Zone is Arnold in?

Arnold is in Calaveras County, EPA Zone 2.

Q: How much does radon mitigation cost in Arnold?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Avg: 5.70 pCi/L

Calaveras County

EPA Zone 2

3 user tests

Arnold in Calaveras County has recorded an average radon level of 5.67 pCi/L, which exceeds the EPA action threshold and reflects the elevated radon potential in California's Sierra Nevada foothills. The community's location on granitic bedrock and decomposed granite soils contributes to these elevated readings in zip code 95223. Homeowners should conduct radon testing and consider mitigation systems, particularly in homes with basements or crawl spaces.

5.70

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Arnold, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Arnold, CA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Arnold, CA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Arnold, California Radon Levels

User-submitted radon test readings from homes in the Arnold area.

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Arnold, CA	21-50 Years	No Basement/All Slab	Jan 2026
6 pCi/L	Arnold, CA	21-50 Years	Partial Basement	Dec 2024

Have a radon test result for Arnold? Submit your reading to help other homeowners.

Arnold Radon Facts

Key details about the radon risk profile for Arnold and the 95223 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Calaveras County, CA

Zip Code

95223

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

5.70 pCi/L

User Tests Submitted

Arnold and the 95223 zip code are located in Calaveras County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Arnold, CA

What is the average radon level in Arnold, CA?

Based on 3 user-submitted tests, the average radon level in Arnold is 5.70 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Arnold in?

Arnold and the 95223 zip code are in Calaveras County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Arnold?

Radon mitigation in Arnold typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Arnold?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in California

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Los Angeles	7.83 pCi/L	6
Mammoth Lakes	10.80 pCi/L	5
San Jose	4.20 pCi/L	5
Rancho Palos Verdes	8.00 pCi/L	4
Woodland Hills	7.67 pCi/L	3
South Lake Tahoe	6.33 pCi/L	3
Palos Verdes Peninsula	6.00 pCi/L	3
Bishop	5.67 pCi/L	3
Sacramento	4.33 pCi/L	3
Oakland	3.33 pCi/L	3
Fresno	10.00 pCi/L	2
Davis	8.00 pCi/L	2
Palo Alto	6.50 pCi/L	2
Studio City	6.50 pCi/L	2
Menlo Park	5.00 pCi/L	2
Truckee	5.00 pCi/L	2
Walnut Creek	4.00 pCi/L	2
San Diego	3.50 pCi/L	2
San Francisco	3.50 pCi/L	2
Belmont	20.00 pCi/L	1